Degree of order and redox balance in B-site ordered double-perovskite oxides, Sr{sub 2}MMoO{sub 6-{delta}} (M=Mg, Mn, Fe, Co, Ni, Zn)

Journal Article · Sat May 15 00:00:00 EDT 2010 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2010.03.004· OSTI ID:21372586

Vasala, S ^[1]; Lehtimaeki, M ^[1]; Huang, Y H ^[2]; Yamauchi, H ^[1]; Goodenough, J B ^[2]; Karppinen, M ^[1]

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1. Laboratory of Inorganic Chemistry, Department of Chemistry, Aalto University School of Science and Technology, P.O. Box 16100, FI-00076 AALTO (Finland)
2. Texas Materials Institute, University of Texas at Austin, Austin, TX 78712 (United States)

We have investigated a series of double-perovskite oxides Sr{sub 2}MMoO{sub 6-{delta}} (M=Mg, Mn, Fe, Co, Ni, Zn) for redox stability, oxygen content and crystal structure. Phases with M=Co, Ni and Zn were found to be oxygen-stoichiometric and stable under oxidizing conditions, whereas those with M=Mn and Fe were oxygen-deficient and stable under reducing conditions. The M=Mg phase is stable both under reducing and oxidizing conditions, showing variable oxygen contents within 0.00<=delta<=0.04 depending on the annealing conditions. Structural data indicate somewhat depressed values for the degree of M/Mo cation order and also evidence of electron transfer from M{sup II} to Mo{sup VI} for M=Mn, Fe and Co. - Graphical abstract: A series of Sr{sub 2}MMoO{sub 6-{delta}} compounds with M=Mg, Mn, Fe, Co, Ni and Zn is investigated for their crystal structure, redox stability and precise oxygen content in order to address systematically the questions concerning the cation (dis)order, oxygen (non)stoichiometry and valence mixing in B-site ordered double-perovskite oxides.

• OSTI ID: 21372586
• Journal Information: Journal of Solid State Chemistry, Vol. 183, Issue 5; Other Information: DOI: 10.1016/j.jssc.2010.03.004; PII: S0022-4596(10)00082-4; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANNEALING
CATIONS
COBALT COMPOUNDS
CRYSTAL STRUCTURE
ELECTRON TRANSFER
IRON COMPOUNDS
MANGANESE COMPOUNDS
MOLYBDATES
NICKEL COMPOUNDS
OXIDES
OXYGEN
PEROVSKITE
STABILITY
STRONTIUM COMPOUNDS
ZINC COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
CHARGED PARTICLES
ELEMENTS
HEAT TREATMENTS
IONS
MINERALS
MOLYBDENUM COMPOUNDS
NONMETALS
OXIDE MINERALS
OXYGEN COMPOUNDS
PEROVSKITES
REFRACTORY METAL COMPOUNDS
TRANSITION ELEMENT COMPOUNDS